Right initial findings on CMS machine. Machine works, having removed the battery and checked the PSU for Rifas (it doesn't appear to have any). I've managed to dump 2 out of the three roms successfully, but the third is a 27513, which is a a 64K ROM but in 4x16K pages. My Wellon sees it as a 27512, and reads it as that but I don't think what it reads is good. I have the data sheet so may try rigging it up to an AVR to read it.

Looking at the documentation I may also be able to use the monitor to bank it in 16K at a time, copy the ROM to RAM, and then *save it to disk.

Disk interface works and I was able to read an Atom / System disk and was able to format a DFS disk with *form80 0 Interestingly the disk interface has lots of blank chip positions and a 40 pin connector on it too. Though I remember reading something about a winchester so maybe they are the options for that.

The keyboard mostly works but unfortunately space is broken (it's a hard switch over membrain type so I don't think it's fixable). But according to the docs it's just serial I think at 5V so should be able to whip up a PS/2 to serial converter with an AVR.